78042259 has 2 divisors, whose sum is σ = 78042260. Its totient is φ = 78042258.

The previous prime is 78042247. The next prime is 78042301. The reversal of 78042259 is 95224087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78042259 - 2⁵ = 78042227 is a prime.

It is equal to p_4561876 and since 78042259 and 4561876 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (78042859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39021129 + 39021130.

It is an arithmetic number, because the mean of its divisors is an integer number (39021130).

Almost surely, 2^78042259 is an apocalyptic number.

78042259 is a deficient number, since it is larger than the sum of its proper divisors (1).

78042259 is an equidigital number, since it uses as much as digits as its factorization.

78042259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 78042259 is about 8834.1529871290. The cubic root of 78042259 is about 427.3430158986.

The spelling of 78042259 in words is "seventy-eight million, forty-two thousand, two hundred fifty-nine".